Dyestuffs of the methine series



Patented Jilly 2, 1940 UNITED I 2,206,108; PATENT 'oF IcE' f DYESTUFFS OF THE METHINE SERIES Werner Miiller, Cologne, and Carl Berres, Leverkusen-Wiesdorf, Germany, assign'ors to General Aniline & Film Corporation, a corporation of Delaware No Drawing. Application August 1, 1939, Serial No. 287,751. In Germany April 26, 1935 4 Claims.

The present invention relates to new dyestuffs, more particularly it relates to dyestuffs of the methine series which may be represented by the 5 general formula:

R ON

Naryl-CH=O R ON hydroxyalkyl, R1 stands for hydrogen, hydroxyalkyl,'alkoxyallgyl, aralkyl or aryl. The group /N Rx stands in para-position to CH.

The new dyestuffs are obtainable by condensing according to methods known per se malonitrile with a para-aminoarylaldehyde of the general formula:

wherein R and R1 mean the same as stated above. As far as these aldehydes are not yet known,'they can be prepared e. g. according to the process described in U. S. Patent 2,141,090,

or in a vmanner analogous to that described in- British Specification No. 17,135 of 1 898, or ac-; cording to the method described in Berichte der Deutschen Chemischen Gesellschaft, vol. 60, p. 119.

In this manner, new and very clear basic dyestufis are obtainable, which according to the components employed, are suited for different purposes, as for instance for coloring of solvents, for dyeing of cellulose ethers and esters.

The invention is illustrated by the following examples, without being restricted thereto, the

parts being by weight:

Examples 17.9 parts of pN-hydroxyethyl-N-methylaminobenzaldehyde and. 6.6 parts of malonitrile are dissolved in 25 parts of alcohol, some drops of piperidine are added and the mixture heated for some time with reflux.

In the said formula R, stands for alkyl or When cold, the .dyestufil crystallizes in yellow crystals which are sucked.

The dyestuff is but slightly soluble in hot water, easily soluble in alcohol, acetone, ethyl acetate and similar solvents. It dyes acetate artificial silk bright greenish yellow shades of good fastness to light and sublimation,

When working in the same way but replacing Y the above used aldehyde by other aldehydes, similar dyestuffs are obtained: I

The dyestufi from p-N-hydroxyethyl-N- butylaminobenzaldehyde and malonitrile melts at 111 C. and corresponds to the following formula:

CH=C(CN):

omomcmom' CHI-CHLOE It dyes acetate artificial silk clear greenish I yellow shades of likewise good .fastness properties.

The dyestuff from p-N-hydroxyethyl-N-benzylaminobenzaldehyde and malonitrile dyes acetate artificial silk the same shades of the same fastness properties. It corresponds to the following formula:

The dyestuff from p-N-hydroxyethyl -N- .phenylaminobenzaldehyde and malonitrile corresponds to the following formula:

CH=C (CN):

The dyestufi from p-N-hydroxyethy1-N-phenylaminobenzaldehyde and malonitrile corresponds to the following formula:

It dyes acetate artificial silk somewhat redder shades than the preceding dyestuffs. It shows very good fastness properties.

The dyestufi from p-N-hydroxyethylaminobenzaldehyde and malonitrile dyes acetate artificial silk bright yellow shades of good fastness' properties. It corresponds to the following formula:

' o11=o(oN)l N; H.CH2.CH2.0H

The dyestuff from p-Nethyl-N-benzylaminobenzaldehyde and malonitrile melts at 136 C. and corresponds to the following formula:

It dyes acetate artificial silk bright greenish yellow shades of good fastness properties.

The dyestufi from p-N-methyl-N-phenylaminobenzaldehyde and malonitrile dyes acetate artificial silk deep yellow shades which possess a very good dischargeability and also otherwise very good properties. It corresponds to the following formula:

N-GH:

The dyestuif from p-(N-p-ethoxyphenyl-N- methylamino)-benzaldehyde and malonitrileis easily soluble in hot alcohol, less soluble in the cold and crystallizes therefrom in light orange needles of the melting point 107-l09 C. The dyestufi corresponds to the following formula:

and dyes acetate artificial silk light orange yellow shades of good fastness to light and sublimation.

This application is a continuation-in-part of our copending application Serial Number 75,226 filed April 18, 1936, now Patent 2,179,895, issued Nov.

We claim: 1. Dyestuffs of the general formula wherein R stands for a member selected from the group consisting of alkyl and hydroxyalkyl, R1 stands for a member selected from the group consisting of hydrogen, hydroxyalkyl, alkoxyalkyl, aralkyl and aryl, and the group stands in para-position to OH, yielding in general clear shades on cellulose acetate silk.

2. Dyestuffs of the general formula alkyl CN stands in para-position to CH, yielding in general clear shades on cellulose acetate silk.

3. The dyestuif of the formula CH=C dyeing acetate artificial silk bright, greenish yellowshades of good fastness to light and sublimation.

4. The dyestuff of the formula N-CHI OOaHs dyeing acetate artificial silk light orange yellow shades of good fastness to light and sublimation.

WERNER MULLER. CARL IBERRES.

CERTIFICATE CORRECTION.

Patent No. 2,206,108. 7 July 2, 1 9uo.

WERNER M'I'ILLER, ET AL It is hereby certified that error appears in the printed specification ofithe above numbered patent requiring correction as follows: Page l, sec- Ond column, beginning with The dyestuff" in line 28, strike out all to and including the word and colon "fgrmulafl in line 50; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office. Signed and sealed this 114th day of January, A. D. l9LLl.

Henry Van Arsdale,

(Seal) Acting Commissioner of Patents. 

